Valve-chest for steam-engines



(No Model.) 2 Sheets-Sheet 1.

W. H. MYERS.

VALVE GEEST FOR STEAM ENGINES.

No. 506,961. Patented Oct. 3,1893.

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UNITED STATES PATENT IfFEIcE.

VILLIAM H'. MYERS, OF BROOKLYN, NEW YORK.

VALVE-CHEST FOR STEAiVh-ENGINES.

SPECIFICATION forming part of Letters Patent N o. 506,061, dated October3, 1893. Application filed May 25,1893. Serial No. 475.491. (No model.)

To a/ZZ whom t may con/cern:

Be it known that I, WILLIAM H. MYERS, of Brooklyn, in the county ofKings and State of New York, have invented a new and useful Improvementin Valve-Chests for Steam-Engines, of which the following is a full,clear, and exact description.-

My invention relates to improvements in valve chests for steam engines,and has for its object to provide a steam chest of a novel construction,which will be adapted for convenient application upon the valve seat ofa slide valve steam engine, and convert it into a steam engine whereonmultiple rocker valves and their appropriate actuating gear can be used,so as to secure all the advantages pertaining to such multiple valves,forl an old style slide valve steam engine thathas been supplied withthe improvement.

To this end, my invention consists in the peculiar construction of thevalve chest and its combination with a steam cylinder,as is hereinafterdescribed and claimed.

Reference is to be had to the accompanying drawings forming a part ofthis specification, in which similar letters of reference indicatecorresponding parts in all the figures.

Figure l is a side View of a valve chest containing the improvement androcker valve actuating gear on it. Fig. 2 is a sectional plan View of asteam engine cylinder and piston in part, and the improved valve chestwith attachments thereon, taken on the line 2-2 in Fig. 1. Fig. 3 isasectional side view of the improved valve chest and valves there- Fig. 4is apartial face view of the valve seat of the slide valve engine,whichis to be itted with the improvement, seen opposite the arrow 4, in Fig.2. Fig. 5- is a side view in part, of the improved valve chest face,which in service is secured upon the slide valve seat of an Venginewhich is to be supplied with the improvement; and Fig. 6 is asectionalview of parts on the line 6`6 in Fig. 3 in the `direction of anindicating arrow in said'iigure.

The steam engine to which the improvement is best adapted forapplication and use, has a horizontal cylinder A, and an elongated valveseat B, which seat extends along the outer side of the cylinder parallelwith its bore, and when arranged for service is vertical on its face.

The valve seat B is shown in Fig. 2, constructed as is usual in thistype of steam engines, having live steam ports a, and exhaust steamports b, formed in its face. The ports a, b, are duplicated, a pairbeing located near each end of the cylinder A, having an intervening barlocated between the adjacent and parallel ports a, b, of each pair. Thelive steam ports a are inlets for steam into the passages a', that areproduced in the cylinder A and extend oppositelyto tap the inner surfaceofthe cylinder at its ends. The other ports b, which lie between thelive steam ports a, have communication with the exhaust duct b', thatextends longitudinally in the cylinder wall, and is tapped at anysuitable point for the discharge of exhaust steam, as indicated at b2 inFig. 2.

The improved valve chest O is cast into rectangular form from'a suitablemetal, and preferably the side wall c, of the chest that is parallelwith the valve seat B is made integral with the other walls of the same.

Such proportionate dimensions are given the chest O as will permit itto[it upon the valve seat B and substantially conform its outer edge withthe margin of the latter.

The face of the chest O that has contact with the valve seat B is madetrue and steam tight, studs or bolts d being used vto secure the chestupon the engine cylinder, which bolts are inserted through holes dformed in the chest and thence into threaded holes d2 produced in thevalve seat B, when the improvement is secured upon it.

There are two steam passages e, f, transversely formed in the chest C,near each end, each'pair being so spaced apart by an intervening wall g,that a passage e will conform with the live steam port a, which is atthat end of the valve seat B, and the passage f with the adjacentexhaust port b.

The valve chest C is rendered light and yet affordedproper strength, bythe production of a rectangular central cavity h, in it, and a smallercavity ,near each end, as shown in Figs. 2 and 3.

At a proper distance from each of the four corners of the chest C, thefour transverse cylindrical steam chambers m, m are produced, whichchambers are formed of an equal diameter, and are rendered true within,for the reception and proper action of the rocking valves n, 'n'.

The pair of chambers m, that are nearest to the top wall of the chest C,are for the reception of live steam,that is conveyed to each Valvealternately through the live steam duct o, which is formed in the wallof the chest, and terminates at each end in one of said chambers, theduct o receiving steam from a supply pipe 19, that is secured in anlinlet aperture which is formed in the cylinder A, and made to intersectthe duct o at any den sired point.

The steam passage e, at each end of the chest C, extends between a steamchamber m, and a lower chamber fm', the latter named chambers beingdesigned to relieve the cylinder A of exhaust steam by the proper actionof the valves n therein, a valve n. in each upper chamber m, controllingthe introduction of live steam into each passage e.

As shown in Fig. 3, the lower steam chambers m are intersected by thebranches f from the exhaust steam passages f, so that a proper rockingmovement of each valve fn will permit the escape of steam from e,through n', into f, and thence into the exhaust duct b', and through h2out of the cylinder. The rocking valves n, n', are set as shown in Fig.3, one live steam port in an upper chamber m, being open when the one atthe other end of the cylinder A is closed; and in the lower chambersfm', the valve n', that is directly beneath the opened valve n, is thenin closed adjustment, which eects a transmission of live steam from theduct o, into the cylinder at the end where these two valves are located,the valve n', in the remaining chamber m', being opened to allowexhausted steam to escape from the cylinder A through o, intof,f, andthence to the exhaust duct b.

The rocker valves fra/n', are preferably actuated by a valve gear ofwell known construction, comprising the rotatably supported crank diskD, rock arms E, pivoted by one end of each to a link E', that is pivotedat its other end to the disk near its periphery, said arms being eachsecured upon a shaft F, that is secured at its inner end to one end of arock valve, as indicated in Fig. 6, the relative arrangement of saidparts being such as will adapt the rotatable movement of the disk D tocommunicate a proper action to the valves n, n', which have been set tooperate as previously explained.

The disk D is rocked a proper degree by an eccentric rod G, that isreciprocated as usual by an eccentric on the main shaft of the engine,and which previously actuated the slide valve that the rocker valvestake the place of.

Rods I pivoted on arms I, mounted on the shafts F extend downward toenter dash pots (not shown), and crank arms J on the shafts F altordmeans to connect each live steam valve fn., with a governor, (notshown,) which parts when in proper adjustment complete the rocker valvegear, thereby converting a slide Valve engine into' a steam engine ofthe multiple rocker valve type, when said parts are employed inconnection with the improved steam chest C, that embodies the featuresof improvement.

Having thus fully described my invention, I claim as new and desire tosecure by Letters Patentl. A valve chest attachable upon the valve seatof a slide valve engine, having a transverse cylindric chamber at eachcorner of the chest, and communicating steam passages formed in thechest, substantially as described.

2. A rectangular valve chest attachable upon the valve seat of aslidevalve steam engine; transverse cylindrical chambers therein near thecorners of said chest, a transverse live steam passage and a parallelexhaust steam passage in the chest near each end, and respectivelyadapted to conform with live steam and exhaust steam ports in the enginevalve seat, which steam passages intersect the chambers and arecontrolled by rocker valves therein, substantially as described.

3. The combination with a steam cylinder, and an elongated valve seatthereon having a live steam port and a parallel exhaust steam port neareach end, of a valve chest attachable to said cylinder, containingtransverse cylindrical steam chambers near the corners of thechest, anda transverse live steam passage and a parallel exhaust steam passage insaid chest near each end, and adapted to conform with the live steam andexhaust steam ports in the valve seat, said passages intersecting thesteam chambers and being con trolled by rocker valves in said chambers,`

substantially as described.

VILLIAM'H. MYERS.

Witnesses:

TRAVIS TAYLOR, AMBRos A. TRIPOLD.

lOO

